Paper trimmer



3 Sheets-Sheet 1 E. B. MURPHY ET AL PAPER TRIMMER Feb. 8, 1949.

Filed April 25, 1945 INVENTORS EDWARD B. MURPHY SAMUEL SEGAL ATTORNEY 'Feb. 8, 1949. E. B. MURPHY ET AL 2,460,842

, PAPER TRIMMER Filed April 25, 1945 s Sheets-Sheet 2 INVENTORS EDWARD B. MURPHY SAMUEL SEGAL L. J 1R ATTORNEY E. B. MURPHY ET AL PAPER TRIMMER Feb. 8, 1949.

3 Sheets-Sheet 3 Filed April 25, 1945 ATTORNEY Patented Feb. 8, 1949 Edward B. Murphy, Linden, N. J., and Samuel Segal, New York, N. Y., assignors to Wilson- Jones Company, Chicago, Ill., a corporation of Massachusetts Application April 25, 1945, Serial No. 590,236

21 Claims. 1

This invention is concerned with paper and/or cardboard shearing means for trimming or cutting sheet material or a stack thereof desirably mounted on a suitable platform or support. The object of the invention is to provide an improved shearing device of the character referred to wherein manual clamping of the stack or work 1 initially gripping the sheet or sheets against the platform or support by automatically controlled compressor means and thereafter automatically and bodily displacing frame means in which said compressor means is guided in a direction away from the support to impart supple: mentary clamping pressure against the sheet or sheets to be severed. A further obiect'of the... invention is to provide means for automatically controlling the operation of the slidably guided compressor or clamping means on the cutting and on the retracting stroke of the swingable severing means. Other salient and important features of theinvention will more readily appear from the following detailed description taken with the accompanying drawings wherein:

Fig. 1 is a plan view of thepaper trimmer or shearing means illustrating the knife in a closed position.

Fig. 2 is a transverse sectional view taken on the line 2-2 of Fig. 1, illustrating the slidable and adjustable gage bar.

Fig. 3 is a side view of Fig. 1, partly in section and partly broken away, illustrating in full lines the swingable knife in a fully raised position, the

slid ably guided presser bar or compressor elevated,and the oscillatable toggle retracted; and

in dash and dot lines, the knife in a partly lowered or closed position, the presser bar in' a partly lowered position and initially clamping the material to cut, and the frame in its normally lowered position although about ready to be elevated by the'pivoted or rotatable cam shaped linksof the toggle coacting with the presser bar.

Fig. 4-is a view along the lines of Fig. 3, however showing the cams of the toggle having passed 2' 1 v their dead centre, the oscillatabletoggle moving again toward a closed position even thoughthe presser' bar is in a squeezing relation lwlththe paper to be severed, and the slidably guided frame bodily raised and maintained in such raised relation during the completion of the closing stroke of the knife.

Fig. 5 is a vertical sectional view on the line 5-5 of Fig. 3 illustrating the frame retracted and the compressor bar elevated and the paper to be severed unclamped.

Fig. 6 is a vertical sectional view on the'line 6-6 of Fig. 3 but on the dotand dash line position of the latter.

Fig; 7 is a sectional and elevational view on the line 7--7 of Fig 4. V

Fig. 8 is a plan view of another embodiment according to the invention, partly shown insection. 7

Fig. 9 is a side" view of Fig. 8, illustrating the knife fully raised, the toggle closed, the presser bar elevated from the paper support and the frame which slidably guides the presser barretracted. Y p

FigQlO is a fragmentary front View of Fig. 9, and I a r Fig. 11 is anenlarged fragmentary view of Fig. 9, partly broken away and partly in section,

- illustrating the toggle shifting forwardly for actuating the presser bar. V

The paper and/or cardboard trimmer is gen-- erally designated T and is characterized by the rectangular shaped support S having the bracket B appropriately fastened thereto. Offset and fixedly extending from this bracket is the bearing 10 rotatably sustaining shaft ll encompassed at one end thereof by the helicoidal spring 12 having one end abutting bearing It! and another end projecting into and fastened to the'body of the nut l3 which together with the lock nut 14 are threadably connected to the threaded portion l5 of the rotatable shaft II.

Fixedly mounted on shaft II to bodily rotate therewith is the knife guard or handle H which carries the adjustable stud I6 having head i! adapted to bereceived'and removably interlock withthe depression'or concavity l8 and adapted to coact with the cam face l9 and ride along face 20 of ear 2| projecting fromthe bearing l0. By the present arrangement, the knife or blade K fixedly carried by the handle H is maintained under adequate pressure against the edge 22 of the flat metal reinforcing bar 23 fixed to the bracket B, the edge 22 being formedby the beveled face 24 and the horizontal face 25 or the parallel bars 39 and, blocks, and the slidable guide posts which embody the enlarged and reduced cylindrical portions 46 and 41. Such relief is provided-by the cam portions 38 coacting with thepresser bar 55 to cause the yoke or frame 62, that is, the parallel guidebars 39 and 40 together with its fixedly secured blocks 4!. and consequently the depending posts :64 to be elevatedbodily relative to the platform or support S, aftertherpresser bar 55 hasinitially clamped and squeezed the papers to be severed against. the support and specifically the reinforcing bar 23 secured thereto. This relief action takes place towards the completion of the downward stroke of the handle even thoughthe sheet or sheets of paper 60 have been clamped firmly by the presser bar 55 and such relief action is possible since the end posts 64, namely, those defined by the enlarged and reduced portions 46 and 41 fixedly carried by the parallel guide bars 39 and 40 are slidably guided and liftable in openings 48' in the bracket B and against the resistance of the power springs 56 which are compressed as the cams 38 cause the frame to be shifted away from the compressor bar.

For example the full line position in Fig. 3'

illustrates the presser bar 55 in anunclamped relation and elevated by the balancing springs 52, the paper 60 to be severed is projected through gap 59, and the toggle defined by the pivoted links 34, 35 and 3'! is closed. In such closed position of the toggle, link L is awaiting the closing of the handle for operating the toggle. On rotation of the links 34 and 31 as the handle moves on its downward cutting stroke, the camsx38 displace the compressor or compressor bar 55 as indicated by the dash and dot lines in Fig. 3 and the toggle is moving to a fully opened position as is also indicated by dash and dot lines in Fig. 3. The stack of papers and/or cardboard 60 is now firmly squeezed together and assumes the thickness of that shown in Fig. 6 as distinguished from its unclamped thickness indicated in Fig. 5.

Since the presser bar 55 is solid against the squeezed paper (Fig. 6) and the handle has not completed its downward stroke, it would be impossible to complete the cutting stroke if the yoke 62 could not be bodily elevated. Consequently, on the last part of the cutting stroke the cam portions 38 of links 34 and 31 acting on the presser bar, elevate the frame or yoke 52 causing the posts 99, embodying the enlarged and reduced portions 46 and 4-! to be slidably raised against the progressive compression of the power springs 56 (Fig. '7), atwhich time of course the toggle is again closed and the knife has completed-its shearing. Thus as the downward stroke is completed the gripping pressure by the pressure bar 55 on the paper 61] to be severed is enhanced or increased in that power springs 56 tend to pull frame 62 downwardly and hence reacting on the earns 38 to more tightly bear against the presser bar. a

With the paper severed by the knife and the latter closed, the yoke or frame 62 is still held elevated (Fig. '7) and the presser bar 55 is firmly clamping the sheet or sheets of paper. Now by raising the handle, the oscillatable toggle is automatically controlled, links 34 and 31 are rotated rearwardly on the fulcrum pins 44 and 45, which action causes the cams to progressively release their former lifting action on the parallel bars 39 and M1, and the latter retract or are lowered automatically upon the expansion of the power springs '56. Also at this time, the cams-,38 leave 6 the pressurepbar 55, and the latter is elevated b the balancing springs '55, thus the severed stack is ungripped, permitting the severed sheets to be withdrawn :from the "gap 59. It is apparent that with the arrangement described, that by the operation of the knife handle, the sheets of paper are automatically gripped prior to severing.

If desired a gagemaybe provided for regulating the width of paperlto be cut by the knife. This gage generally 65 is slidably guided along track 66 which isa bar of metal suitably fastened at the rear margin of the support or board S. The gage 55 has a depending flange 61 adjustably receiving the threaded shank 68 carrying the manipulatable head 69. 'Fixedly attached to shank 68 is a clamping plate I0 and fixedly fas tened to the underneath face of the gage is .a rectangularly shaped rod l l, which together with the clamping plate 19 removably and slidably straddle track 66, which is adapted to'rectilinearly guide the gage along the support or platformsand after the distance between thebeveled faces 22 and the gage is determined, plate I0 is tightened against thesupport by'manipulator 69. By this action, the gage may be slid along the support and quickly set and clamped. A flange or'rod 12 is also secured to 'the-underface of the age to provide a stop for the papers to be severed.

In the'embodimentaccording to Figs. 8-.-11, the

operation of the presser bar isindependent of the controlof the pivoted handle H to which the knife K is fastened. The handle H is fixed to the shaft 8| journalled in bearin B appropriately fastened to'the board or support S having secured thereto the spacing blocks or mounts 82 and 83 :each provided with the beveled faces 84 at the ends thereof to allow for the positioning of the slidably guided posts or rivets 85 fastened tothe web 86 of the Ushaped or channeled members broadly. designated 81' each having upstanding and spaced sides or legs 88 closelystraddling and fixedly secured by pins or rivets B9 to the bar 90. Y 'Interposed between the spaced sides 89 0f the channeled spaced members 8'! and vertically and slidably guided thereby is the clamping or presser bar provided at each end'with a reduced terminal 9| and the relief shoulder 92, the latter defining with the lower margins 93 of the presser bar 80 the recesses 95 to permit the presser bar to clear web 86 of the channeled members 81' and press against the metal reinforcing bar or knife 95' fixed to the support or platform S and this bar has the beveledface'96 in yieldingly pressural engagement with the knife K when the handle-H is moved downwardly and to a closed position.

Helicoidal equalizing springs 9'! are suitably retained between the reduced terminals 9| of the presser bar 80 and webs of the channeled memhere 81. These springs automatically retract the clamping or presser bar 8i} after the swingable links-98'and; 99 have been shifted to their retracted or closed position illustrated inFig. 9 upon manipulation of the extension or handle I00 of link 98. -Links 98 and 99 are pivoted to the upper bar fixed to the spaced channeled members 81 by the fixed fulcrum pins NH and H32 and the cross or interconnectin link N13 is pivoted to the links 98 and 99 by the fulcrum pins I84 and I05 fixedly carried: by.the cross link I93 which when the handle )0 is operated always movessubs'tantially parallel to the slidably guided clamping bar 80 which in turn'is also caused to be guided ver-' tically and. rectilinearly 1 byv its pins I06 project 1. m1: 22min spasm sid'ss thereof into the alined gums slots tllz'l' :mieaehofthesides sa-of the .channeled members 81.

7 when toggle arrangement defined .ibythe pivotedlinks 98, 89 and 1193' is closed as; in Fig". 9', the elamping bar or compressorhasibeen elevated automatically "to. its highest position by springs sland such position is controlled liy the ends of the aimed slots I'M in'the spaced sides'all; The upper en'ds of slots-M 1 therefore eharaeterize stop means to limit upware dis plaeementof the clamping bar 8lllwhichxdefins the upper face of the "reinforcing bar 85' a suitable {gap oith'roat ass for the reception "of one or more sheets of paper and/orwcardbbard 89 to he ssverelzl by the swingahly guided'flini'fea :Each-iofthe links 93 and 89: furedly'carriesa cylindrical projection H8 serving 'aspainmeans' adapted tosimultaneously ride alongthe top face ofiithe clamping liar 80- to actuate depress orcarn the latter for "clamping the: sheets of paper against the reinforcing bar 23 of course when tlish'andie rim-"is rotated 'eounter clockwise (Fig. 9.)l in'i the matter of opening the toggle and ifleandle' lflfi'is so rotated the toggle. progressively opensmntilrthe pressurebar Bi initiallyplamps theload or paper we against the reinforcing bar' 95'. Further rotation-of thehahdle 100a; the same direction causes the toggle tofurther' open and the projections or cams H0 ride along and abut. the pressure bar thus more firmly causing the'latt'er to grip the paper to he severed. However, since pressure bar isolampe'd against the paper and the paper is against the fixed reinforcing bar 95, further pressure on the pressure bar by the fixed projections H0 would cause the latter to jam unless some relief would. be provided to permit the projections. Hflto continue. their movement until the fixed stop or pin 1 H is reached. Such relief is provided by permit ting the spacedchanneled members 81 together with their interconnected'fixed bar 99 to be slidably and bodily elevated relative to the pressure bar. In this way greater pressure may be applied to the clampingbar, which pressure is maintained in -that the frictional relation between the actuating projections H0 increase as link 98 and its projection H0 move towards; and against the stop HI fixedly projecting from the compressor or pressure bar 80. Consequently, after cams H0 have passed their dead centres; when moving inacounteroloohwise direction, in creased pressure is applied'by thesecams or pro jections H8, thus move firmly? frictionally looking. the compressor bar on the work or paper formerly projected into throat Hi3- and the ex: tent ofthe expansion of the toggle is controlled by stop'pin l l I coasting with one of the cams H0;

The frame F, defined by the spaoedchanneled members 8i and their common interconnected fixed bar 935 when bodily elevated. rises against the resistance of the power helicoidal springs l I 2 surrounding the front and: rearposts 85slidablyguided. in the openings H3. These springs are normally expanded and are retained in recesses H 4 in the support S and onthe hostsfliby the washers H5 acted on by adjustable" clamping means 156. The action of the power springs H2 isto normally hold the channeled members: or spaced; yokes a? of the frame F seated against the reinforcing bar 95 when no pressure. is e):- erted by the pressure or clamping lbar 8'0 on the stack of papers to be severed;

By the present arrangement it is apparent that as; frame F or guide means: for the com? pl'e'sswblwlaniping. tar iii-is bodily elevated aftor the initial grippinzof the sheet or sheets of paperto befsevered; their spailoed "posts Wilke i'v'ise aiie-.-slidably raised; and hence the power springs 1 l2- :areeompressed, thus'in fact tending toiur'geithe rramenownwarmy but such. action is resisted because Tot the ftitional lock imparted by the. pro;iectiohor;cam H0 611 the pressure 'bar 80, andlbtinseqixently the latter-is held in a set and in aw-enhanced or increased clamped position aiterimtia'lly gripping the paper. Because the hams Fina? *bebodily elevated, such action rsvisessde uate relief to permit liiiks '98 and 9'!) totally oide'nits toggle and thus enhance supple meritaryiglllpping pressure of the press'ure bar on the stackrof sheet material. To unlock the handleliil/the latter is rtitated clockwise (Fig. 110,. thus projection its gradually releases its prisms ohthtenlaMfiing bar 88, and the frame slidablegfaided frame the guide means for the eomp'iessor bar, is rectilinearly retracted and automatically due to the immediate expansion of the counter balaneihg springs H? and will again resetesz'thereinforcing barn. Also the pressure bar ai -automatically rises because of the sxpan slofl of the equalizing and balancing springs -9l and-the paper stack may be new readily with arawn froth sap m8;

Pressaral engagement of the knife K against edged-1i; (Fig; lolorthe reinforcin bar 95' anthedownwardor closing 'swin'gable stroke of the knife handle is caused-"by the action or the lisiieoidal spring H8: having its free end us the raised-and fixed bar :29 and its other 'hcll zt is anchored to one of the lock huts 1'22 lijusfiablyliel'd'hhshafttll By this arrange= iiiflfi oh tfl downward stroke of the handle, spring H8 is" compressed and onse'qu'eritly the tilehhiidle' but 5f! the completion Of its news stroke it shutsthe rubber bumper I23.

sash of the embodiments disclosed,- a spring eontrellscl'and slldabl y guided compressor bar is unlisted. to initially grip "the Work 01" sheet ma.- terial tops severed and subsequently the frame which sliuablgr guides the compressor bar but whieh'is normally held retraeted relative totl'l'e support or platform is bodily elevated or raised against the resistance of power spring means aridthus reating: thr'ough toggle or actuator means toprovideadued or enhanced pressure on the pressure bar or compressor; hence more firmly gripping the paperas desired. such action' takes place automatically either in the manual control: of the embodiment according to -s 84-1 61 bathe oscillation of the handle H or: the-form illustrated in Figs. 1=-'7-.

Various changes may be made in the details of eohstraenon and arrangement ef parts without departing from the spirit of the invention or sacrificing any of the advantages therein.

' We claim:

il in combination, apiatform' for supporting sheet material; salami-1gspring means above sald jplatierm, a compressor normally held salusprihsrne and away from said platform for. removablyclamnlng saidniaterial asainstsald platform; giiiclsmeans linearly shiftabls relstlveto sampmtfor'm for-movably disses maths displaeenlentoi said-compressor to clamp SAQOL ing the clamping relation of said compressor against said material for displacing said guide means bodily in a direction away from said compressor and platform for increasing saidclainping relation, and shearing means for severing said material in the clamped relation -of the latter.

2. In combination, a platform for supporting sheet material, balancing spring means above said platform a compressor-normally sustained by said spring means above and away from said platform for removably clamping said material 7 against said platform, guide means slidably mounted on said platform for movably directing the displacement of said compressor to clamp or unclamp said material, power "spring means, means operative during the clamping relation of said compressor against said materialfor displacing said guide means bodily and'linearly in a direction away from said compressor and platform against the resistance of said power spring means for sustaining and enhancing said clamping relation, and shearing means swingable relative to said platform for severing said material in the clamped relation of the latter.

3. In combination, a platform for supporting sheet material, a frame having means slidably guided relative to said platform, a compressor bar slidably guided by said frame, power spring means for normally holding said frame retracted relative to said platform, means for actuating said bar for clamping or unclamping of said Inaterial, means effective during clamping of said material for bodily elevating said -f rame awai7 from said bar and relative to said platform against the resistance of said power spring means, and means for shearing said material during clamping thereof by said compressor bar.

4. In combination, a platform for supporting sheet material, a framehaving means slidably guided relative to said platform, a compressor bar slidably guided by said frame, power spring means for normally holding said frame retracted against said platform, actuating means for operating said bar for clamping or unclampingof said material, means carried by said actuating means and effective during clamping of said material by said bar against platform for bodily elevating said frame away from, said barfand relative to said platform and against theresistance of said power spring means; and means for shearing said material during the clamping thereof by said compressor bar.

5. In combination, a platform for..supporting sheet material, a frame having spaced posts slid-.- ably guided relative to said platform, a; compressor bar slidably guided by said frame, power spring means about said posts for normally holding said frame against said platform, actuator means for operating said bar for clamping or unclamping of said material, means carried by said actuator means and effective during clamping of said material for bodily elevating said frame away from said bar and platformand against the resistance of sa d power springmeans,

clamping thereof by said compressor bar.

6; In. combination, a platform for-supporting sheet material, a frame having spaced posts slidably guided relative to said platform, a, com pressorbar slidably guided by said frame, equalizing spring means for normally holding}; said be? elevated and away from said material power springmeans about said posts, for normally hold and mean for shearing said materialduring the I sheet material, a'compr essor bar for removably clamping said material, guide means for linearly directing said bar towards or away from' said material, a toggle pivoted to said guide means and having projecting means for shifting said bar to removably clamp said materiahmeans for automatically shifting said baraway from said material upon'removal of the clamping relation of said bar from said material, and swingably guidedmeans for severing said material in the clamped relation thereof. a a

8. In combination, a platform for supporting sheet material, a bar, a frame having means for slidably guiding the ends of said bar, balancing spring means at said ends for holding said bar normally elevated and away from said platform, swingablemeans connected to saidframe for actuating said bar for initiallyclamping said material against said platform, means for. rectilinearly guidingsaid frame, power spring means cooperating with said frame to normally hold the latter against said platform, said swingable means pursuant to said initial clamping 0f said paper by said bar progressivelyincreasing .pressure on the latter byelevating said frame away from said platform against the resistance-of said power spring means, and a swingable knife for severing said sheet material in the increased pressural engagement of said bar on said material. Y

I combination, a platform for supporting sheet material, acompressor barfor removably clamping said material, a frame having means for linearly guiding said bar towards or away from said material, means for .movablyguiding said frame towards or away from said material, toggle means pivoted to said. frame and having meansfor shifting: said bar to clamp said material, spring means for automatically shifting-said bar away from said material upon removal of the clamping relation of said bar-from said materialspring means for'resisting movable displacement of said frame away from said material,- and 7 swingably guided'meansifor severing said'material in the clamped relation thereof. 9

10. In combination, a platform for-supporting sheet mater al. a compressor barlfor removably clamp n -sa d material, a'frame for linearly guiding said bar towardsoraway 'from'said material; means for slidably guiding said frame relative to said. platform, spring meansto" resist slidable displacement of said frame away from said material.- a tog le pivoted to said frame and having means for-shifting said bar to removably clamp said m aterial, means for automatically shifting= saidbar away from saidmaterialupon removal of. the clamping relation of said bar from said materiaL'swingably guidedfmeans for se 've rir' g-said materialin the clamped relation thereofpand meansconne'cted to saidtoggle and severing means for automatically actuating. said toggle upondispl-acement of said severing means ramve g platform' todisplace said bar against said materialfand to bodily displace said anew frame-away from saidihar against the resistance oi saidspring means. i

11. In combination, a platform for supporting sheet material, acompressorhar, a frame, means for linearly guiding said'har'relative to said frame tc-removably clamp said material; toggle means pivotedto-saidframe-for'operating said ban cuttingmeansswingably connected't'o said platform, n eans for automatically displacing said "toggle means jin response to displaceme'ntrof said. outtingngeans means for'slida-bly guiding said frame relative to said platform; and spring means for yieldingly resisting displacement of said frame relative to said platform.

12. m combination, a platform for supporting sheet-material, acompressor-bar, a frame; means for: linearly guiding said barrelative to said fir-ameto removably' clamp said material, actu- Eater-means for operating said bar, cut-ting means swingably connected tosaid platform, means for automatically displacing said actuator means in response-to displgcementofsaid cutting means, means for slidaioly guiding said frame relative to said platform, spring" means foryieldingly. re- 'sisting displacement of said-frame relative to said banin--theclamped relation of the latter against said material; andspringmeans forautomatically displacing saidma-r 'awayfroin saidimaterial' pursuant tothe removal or said clamped relation.

1321p a paper trimming machine; a platform material; means for operating said cam means Stondisplacing" said bar to initially clainpsaid 1115*91131 and fOrsubSeQuently bodily elevating saidi'frame awas fromsaidplat-form' and against the resistance of said? power-spring means, and a; knife for: shearing said material duringthe clampodfrelationthereof; p

'14: Ima'papertriznrningmachine; aplatform forsupporting: sheet-f material, a compressor bar, enema above said platform; means for slid'afoly uiding saidiliarin'said' frame; equalizing-spring meansiinterposed hetween-said platform and iaar for normally lioldingthe latter spaced from said platform, means for slidably: guiding said frarnei relativeto said-platform, cammeans for shifting saidrbar to removably clamp s'aid 'materialagainst saidoplatform; powerspring means fonyieldingly resistingdisplaoement of: frame in. a direo-.

'tion: away from said: ban and: platform: in-othe clamped: relation; ofqsaidbaragainst Said-"material, toggleimeans pivotedtosaidairameior cont2 platform; means for slidably guiding said frame relative to said platform, cam means for shifting saidoarto removably clamp said materialagainst saidplatformypower spring means for yieldingly resisting displacement of said frame in a direction away from said bar and platform in the clamped relation of said bar against said material, toggle means pivoted to said frame for controllingsaid" cammeans to displace said bar to initiallyclamp said material and for subsequently bodily-elevating said frame against the resistance ofsaid power spring means, cutting means for shearing said material during the clamping relation thereof; and means for automatically operating saidtoggle upon the displacement of said cutting means.

16.1 In combination, a platform for supporting sheet material; bearing means mounted on said platform,.a,f-rame having spaced channeled members and" including an interconnecting bar spaced from said bearing means and secured to said members, spaced posts secured to said frame and projecting through and slidably guided by said healing means, a shiftable compressor bar below said interconnecting bar and having ends slidably guided by said members, equalizing springs within said members and surrounding said posts andnooperating with said ends for normally holdmg saidoompressor bar away from said bearing means, powerspring-means about said posts to resist displacement of said frame away from said bearing means; actuating means connected to said interconneotingbar for operating said oompressor bar to clamp said material against the resistance of said equalizing springs and to shift said=frame awayfrom said-compressor bar against theresist'ance-of said power spring means, and a swingable lmife cooperating with said bearing meansior seveiinggsaid material;

17; In comie'ination; a platform for supporting sheet material, heating means mounted on said platform; a framehaving spaced channeled membersandineluding-aninterconnecting bar spaced i'rom said bearing means and secured to said members; spaoed posts secured to said frame and projecting through and slidably guided by said bearing;meansjar shiftable compressor bar below said inte onnecting: bar and having ends slidabiy guided 'by-said members, equalizing springs within said 'membersand surrounding said posts and booperating with said ends for normally holding said compressor liar away from said bearing means; power spring: means about said posts to resist displacementofsaid'frame away from said trollingsaidcammeanss'tor displaeeasaid bar to 15'. In a paperl trimming machine, a platform ,for. supporting sheet material, a compressor bar,

a frame, above saidplatform, means ior slidably guiding said bar in said frame; equalizing spring means interposed between said platform andbar, Ior normally holding the'latter "spacedfromsaid" bearing means,- actuating means connected to saidint'erconnectihg bar for operating said'compressor bar to-clamp said material" against the resistancwof said equalizing springs and to shift saiddrameaway ironrsaidcompressor car against the resistance of said power spring means, a

fswingalale knife cooperating with said bearing means for severing saidmaterial, and means to limit the retraction ofsaid frame upon releasing of said compressor bar-from said material.

18. In'comloination; a platform for supporting sheet material; ibearing means mounted on said platform, a; frame having spaced channeled and slotted members and including an interconnectihgbarspaced from s-ald'"bearing means and secured to s-aid members, spaced posts secured to said frame and projectir ig through and slidably guidedsaid bearingmeans, a shiftable compressor bar" below 'said' interconnecting bar and lmvingmln' mcansslidably guided by said slotted manners; equallzing'springs within said members material.

13 and surrounding said posts and cooperating with said ends for normally holding said compressor bar away from said bearing means, power spring means about said posts to resist displacement of said frame away from said bearing means, actuating means connected to said interconnecting bar for operating said compressor bar to clamp said material against the resistanceof said equalizing springs and to shift'said frame away from said compressor bar against the resistance of "said power spring means, and a swingable knife cooperating with said, bearing means for severing said 19. In combination, a platform for supporting sheet material, bearing means mounted 'on said,

v paced po ts depen ing from said blocks and slidi;

- ably guided by said bearing means; a compressor platform; a slidable frame comprising spaced guide bars, block means secured to said'bars, and

spaced posts depending from said blocks and slidably guided by said bearing means; a compressor 7 bar below said guide bars and having spaced ends slidably guided by said posts, equalizing springs surrounding said posts and cooperating with said ends for norm-ally holding said compressor, bar

away from. said bearing means, power spring,

means about said posts to resist slidable displacement of said frame away from said bearing means, cam means pivotally connected to said guide bars for operating said compressor bar to removably clamp said material against the resistance of said equalizing springs and to shift said frame bodily away from said compressor bar against the resistance of said power spring means;

driven means for actuating saidcam means, and

a 'swingable knife pivotally connected to said driven means and cooperating with said bearing means for severing said material. I

20. In combination, a platform for supporting,

slidably guided by said posts, equalizing springs surrounding said posts and cooperating with said ends for normally holding said compressor-bar away from said bearing means, power spring means about said posts to resist slidable disp1ace- I ment of said frame away from said bearing means, toggle means pivotally connected to said guide bars and including cam means for operating said compressor bar to removably clamp said material against the resistance of said equalizing springs and-to shift said frame away from said bar below said guide bars and having spaced ends 3 slidably guided by said posts, equalizing springs surroundingsaid posts and cooperating with said ends for normally holding said compressor bar away from said bearing means, power spring means about said posts and below said equalizing springs to resist slidable displacement of said frame away from said bearing means, toggle means pivotally connected'to said guide bars and having spaced cam means'for operating said compressor bar to removably clamp said material against the resistance of said equalizing springs and to shift said frame away from said compressor bar against the resistance of said power,

spring means, a link pivoted to said toggle means, v and a swingable'knife connected to said link and cooperating with said bearing means for severing said material. a v r v EDWARD B.

SAMUEL EGAL;

REFERENCES crrnn The following rer rnc s are of'record in the fil o i patent:

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